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Cheap flights from Chicago (CHI) to Seattle (BFI)

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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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Cheap flights from Chicago to Seattle in February , March 2026

08 Feb - 06 Mar $ 1,014.00
CHI
Chicago
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
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08 Feb - 06 Mar $ 1,027.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
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08 Feb - 30 Mar $ 1,029.00
CHI
Chicago
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
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Last minute flights from Chicago to Seattle

08 Feb - 02 Mar $ 1,203.00
CHI
Chicago
Allegiant Air
3 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
2 STOPS
CHI
Chicago
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08 Feb - 02 Mar $ 1,215.00
CHI
Chicago
Allegiant Air
2 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
2 STOPS
CHI
Chicago
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08 Feb - 02 Mar $ 1,301.00
CHI
Chicago
Allegiant Air
2 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
2 STOPS
CHI
Chicago
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One-way flights to Seattle from Chicago

3:22 PM - 2:45 PM
Air Excursions
3 Stops
26h 13m
CHI - BFI
$ 617
Kiwi
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1:24 PM - 2:45 PM
Air Excursions
2 Stops
28h 11m
CHI - BFI
$ 630
Kiwi
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9:38 PM - 2:45 PM
Air Excursions
2 Stops
19h 57m
CHI - BFI
$ 716
Kiwi
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

Related info for your journey
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.